Budget carrier AirAsia is to fly from Stansted to Kuala Lumpur and on to Perth for a one-way cost of £200 from March.

It is thought connecting flights to other Oz cities such as Melbourne and Brisbane will also be available.

The deals - which went on sale yesterday - are less than half the normal cost and a spokesman for AirAsia said: "These represent record lows." However, a spokesman for the Aviation Environment Federation, which campaigns for eco-friendly travel, warned similar deals will soon be unsustainable.

He added: "With fares like this, people don't take into account other costs - such as noise, local air pollution and climate damage."